我国IPO长期市场表现的实证研究——基于超常收益率不同测度方法的比较分析

本文选取1995年1月至2000年12月沪深两市774个A股IPO样本,计算IPO的等权平均、流通市值加权平均和总市值加权平均收益率,并使用不同的市场指数及配比股票组合的收益率加以调整来评价IPO的长期市场表现。经过事件时间和日历时间的实证研究发现:(1)我国IPO在上市后3年内总体上表现出长期强势。(2)IPO长期超常收益率对使用何种参照指标的收益率来调整以及使用何种加权平均方法很敏感。CAR和日历时间研究的结果更明显地表明我国IPO存在长期强势特征,而且使用市值加权平均方法计算的正超常收益率更为显著。(3)Fama-French三因素模型和CAPM模型回归的截距项都表明我国IPO存在正的长期超常收益率。     

Does the Market Incorporate Previous IPO Withdrawals When Pricing Second‐Time IPOs?

This paper examines the initial public offering (IPO) valuations of issuers that return to the IPO market successfully after withdrawing their first IPO attempt. We find that these second-time IPOs sell at a significant discount relative to similar contemporaneous IPOs that succeed in their first attempt. We also demonstrate that switching underwriters on the second IPO attempt reduces, but does not eliminate, the discount for second-time IPOs. When compared to their matched first-time IPOs, second-time IPOs have similar price revisions and post-IPO long-run stock and operating performances. Overall, these results suggest that the negative information conveyed by the withdrawal event is incorporated into the lower offer valuations for second-time IPOs. Switching investment banks can mitigate, but not eliminate, the perceived higher risk of the second-time offerings.     

An empirical analysis of Mexican and US closed-end mutual fund IPOs

We examine 135 Mexican closed-end fund IPOs and 370 Mexican non-fund IPOs that issued between 1994 and 2003 along with 217 contemporaneous US fund IPOs and document three primary results. First, we find that Mexican IPOs in the aggregate experience no significant underpricing, unlike their US IPO counterparts. Both Mexican and US IPOs experience significantly negative long-run performance. Second, Mexican closed-end fund IPOs experience positive long-run performance, significantly better than Mexican non-fund IPOs which experience negative long-run performance. Unlike Mexican fund IPOs, US fund IPOs experience negative long-run performance. Third, we find that both Mexican and US debt-backed closed-end fund IPOs significantly outperform equity-backed closed-end IPOs. In Mexico, debt-backed funds experience positive abnormal returns, compared to negative abnormal returns for Mexican equity-backed funds, US debt-backed funds, and US equity-backed funds.     

The IPO Derby: Are There Consistent Losers and Winners on This Track?

We examine the individual and joint relation of discretionary accounting accruals, underwriter reputation, and venture capital backing with the long-run performance of initial public offerings (IPOs). We find that although correlated to some extent, these variables do not manifest the same underlying phenomena in their relation to IPOs' performance. The confluence of the variables is more important than using any one of them individually to identify IPOs that exhibit abnormal long-run stock returns. The combination of their negative aspects helps identify extreme underperformers. We also identify a set of winner IPOs by combining the positive aspects of the three variables.     

Cycles in the IPO market

We develop a model in which time-varying real investment opportunities lead to time-varying adverse selection in the market for IPOs. The model is consistent with several stylized facts known about the IPO market: economic expansions are associated with a dramatic increase in the number of firms going public, which is in turn positively correlated with underpricing. Adverse selection is procyclical in the sense that dispersion in unobservable quality across firms should be more pronounced during booms. Taking the premise that uncertainty is resolved (and thus private information revealed) over time, we test this hypothesis by looking at long-run abnormal returns and delisting rates. Consistent with the model, we find (a) greater cross-sectional return variance, and (b) higher incidence of delisting for hot-market IPOs.     

IPO flipping in Australia: cross-sectional explanations

We access electronic share settlement records for each subscriber and aftermarket investor in 419 Australian IPOs to investigate whether initial subscribers flip their allocations, and we relate this flipping behaviour to issuer, shareholder, underwriter and market characteristics. We find that the main determinants are underpricing (consistent with the disposition effect, i.e., a tendency to realise gains before losses), whether the IPO market is “hot” (a proxy for the representativeness heuristic) and ex ante risk characteristics. When flipping is analysed separately for underpriced and overpriced IPOs we find that the most overpriced IPOs are flipped more than the less overpriced ones, a result which contrasts the disposition effect. This result is due to the action of institutional, rather than individual, investors. We also relate flipping activity to the firm's long-run return, and find that the flipping behaviour of large (informed) investors is unrelated to long-run returns, while uninformed investors consistently flip more of the IPOs that have better long-run returns.     

Are IPOs Really Underpriced?

While IPOs have been underpriced by more than 10% during thepast two decades, we find that in a sample of more than 2,000IPOs from 1980 to 1997, the median IPO was significantly overvaluedat the offer price relative to valuations based on industrypeer price multiples. This overvaluation ranges from 14% to50% depending on the peer matching criteria. Cross-sectionalregressions show that "overvalued" IPOs provide high first-dayreturns, but low long-run risk-adjusted returns. These overvaluedIPOs have lower profitability, higher accruals, and higher analystgrowth forecasts than "undervalued" IPOs. Ex post, the projectedhigh growth of overvalued IPOs fails to materialize, while theirprofitability declines from pre-IPO levels. These results suggestIPO investors are deceived by optimistic growth forecasts andpay insufficient attention to profitability in valuing IPOs.     

Value versus growth in IPOs: New evidence from Finland

This paper focuses on the underpricing and the short- and long-run performance of Finnish initial public offerings (IPOs). More specifically, we examine whether there are differences between the performance of value and growth stock IPOs in the Finnish stock market. Our results indicate that growth stock IPOs are slightly more underpriced and have marginally higher short-run returns. However, value stock IPOs are better long-run investments and provide higher returns during the first three years in the aftermarket. We also document that the apparent long-run underperformance of Finnish IPOs can be largely explained by size, book-to-market, and momentum effects.     

An empirical investigation of Yankee stock offerings

This paper examines the operating and investment performance of 100 foreign firms that conduct their initial public offerings (IPOs) in the U.S. (Yankee stock offerings). The uniqueness of these firms is that the U.S. IPOs are their first public equity issue in any market, including the home market. We find significant improvement in the operating performance subsequent to these U.S. IPO events and firms from countries with poor investor protection benefit more. Compared to various benchmarks, unlike the significant underperformance of IPOs documented in many countries, these firms show no significant abnormal long-run stock market performance after 1, 3, or 5 years of seasoning. The findings are consistent with signaling and selective entry hypotheses.     

Long-run stock performance of German initial public offerings and seasoned equity issues

We estimate the long-run stock performance after initial public offerings (IPOs) in the German capital market with a larger sample than prior studies and alternative benchmarks (the equally and the value-weighted market portfolio, size portfolios and matching stocks). In addition we present the first results on the long-run performance after seasoned equity issues (SEOs) in Germany. We conclude that size portfolios and matching stocks are better benchmarks than market portfolios. Using buy‐and-hold abnormal returns, we estimate that German stocks involved in an IPO or in a SEO, on average, underperform a portfolio consisting of stocks with a similar market capitalization by 6% in three years. This is considerably less than the underperformance after IPOs and SEOs in the US market reported by Loughran and Ritter (1995) and the underperformance after IPOs in Germany reported by Ljungqvist (1997). We also show that the apparent underperformance of the 1988–1990 IPO cohort discussed by Ljungqvist (1997) disappears when the abnormal performance estimate is based on size instead of market portfolios.     

Do Privatization IPOs Outperform in the Long Run?

This paper investigates the long-run stock returns of privatization initial public offering (IPO) firms using a sample of 241 privatization IPOs from 42 countries during the period 1981-2003. We compare one-, three-, and five-year holding period returns of privatization IPOs to those of the domestic stock market indices and to size and size- and book-to-market equity ratio (BM)-matched firms from the same countries. Consistent with previous studies, we find that privatization IPOs significantly outperform their domestic stock markets in the long run. However, they show less consistent abnormal long-term stock performance relative to their size or size- and BM-matched benchmark firms.     

The timing of initial public offerings

We study the dynamics of IPOs by examining the tradeoff between an entrepreneur's private benefits, which are lost whenever the firm is publicly traded, and the gains from diversification. We characterize the timing dimension of the decision to go public and its impact on firm value and the evolution of firm risk over time. By endogenizing the timing of the decision to go public, we explain the clustering of IPOs and buyouts in time, the industry concentration of IPO waves, the high incidence of reprivatization of recent IPOs, and the long-run underperformance of recently issued stock relative to the shares of longer-listed companies.     

Conflict of interest and certification in the U.S. IPO market

We examine the long-term return performance of U.S. IPOs underwritten by relationship banks. We show that, over one- to three-year horizons, IPOs managed by relationship banks experience buy-and-hold benchmark-adjusted returns that are similar to those observed for a matching sample of stocks managed by non-relationship underwriters. This result holds even when the returns' skewness and cross-sectional correlation is accounted for. Further, we examine the calendar-time returns on a portfolio that is long the stocks underwritten by relationship banks and short ex-ante similar stocks taken public by non-relationship institutions. Again, we conclude that the two groups of IPOs yield similar long-run returns. These findings support the certification role of relationship banks and suggest that, in this respect, the effect of the 1999 repeal of Sections 20 and 32 of the Glass–Steagall Act has not been negative.     

Conflicts of Interest and Research Quality of Affiliated Analysts in the German Universal Banking System: Evidence from IPO Underwriting

The quality of equity research by financial analysts is a prerequisite for an efficient capital market. This study investigates the quality of earnings forecasts and stock recommendations for initial public offerings (IPOs) in Germany. The empirical study includes 12,605 earnings forecasts and 6,209 stock recommendations of individual analysts for the time period from 1997 to 2004. The focus of this study is on analysing the potential conflicts of interest that arise when the analyst is affiliated with the underwriter of an IPO. In a universal banking system these conflicts of interest are usually more pronounced and therefore interesting to investigate. The empirical findings for the German financial market suggest that earnings forecasts and stock recommendations of the analysts belonging to the lead-underwriter are on average inaccurate and biased, indicating some conflicts of interest. Moreover, the stock recommendations of the analysts that are affiliated with the lead-underwriter are often too optimistic resulting in a significant long-run underperformance for the investor. In contrast, unaffiliated analysts provide better earnings forecasts and stock recommendations that result in a superior performance for the investor.     

Are there long-run implications of analyst coverage for IPOs?

Analyst coverage has been cited increasingly as an important attribute in the selection of an underwriter for a firm about to go public. However, it has also been alleged that affiliated analysts provide biased research. In this study, we examine these interrelated issues by examining the long-run performance of IPOs with coverage from their managing underwriters in a 1993–2003 sample. We find that (1) analysts’ research coverage from their managing syndicate is not related to long-run performance; (2) long-run performance is not different for firms that receive all-star analyst coverage; and (3) investors are not systematically worse off for following lead underwriter recommendations.     

Greenness index: IPO performance and portfolio allocation

This study examines how the greenness of the firm affects the short- and long-term performance of IPOs. To measure the greenness of the firm, we develop the Greenness Index based on the emissions produced. We find that the greenness of the firms operating in services and financial sectors is higher than in other sectors. To examine the short- and long-run performance of IPOs, we classify our sample into high and low green firms. In the short-run, high green firms obtain a lower return than low green firms. However, high green firms perform better than low green firms in the long-run. This study also determines the factors that cause short- and long-run performance, and the results suggest that the firm’s greenness negatively influences initial returns and underperformance of IPOs. Finally, we develop a theoretical model in terms of the portfolio's allocation and assert that investors participate in high-green firms to optimize their portfolio.     

Model specification and IPO performance: New insights from Asia

This study examines the post-issue stock price performance of initial public offerings (IPOs) from advanced and emerging Asian markets from 1991 to 2004. We provide a comparative assessment on the short- and long-term stock performance of Asian IPOs with comprehensive international evidence. We use several different methods to examine the robustness of IPO performance. Our results reveal that whilst there is initial underpricing in Asian IPOs, the existence of long-run underperformance for the Asian IPOs depends resoundingly on the methodology used for assessment.     

Are REIT IPOs Unique? The Global Evidence

Previous studies of real estate investment trust (REIT) IPOs have focused primarily on REITs listed in the U.S. These studies in general find that, unlike industrial firm IPOs, REIT IPOs in the U.S. exhibit an abnormally low initial-day return and mixed long-run performance. Our study examines this puzzle using a large sample of 370 REIT IPOs from four continents (14 different countries) during the 1996–2010 period. We find that (1) the newly-established REITs in other countries exhibit similar initial-day return pattern as in the U.S., (2) the low initial-day return might be caused by the fund-like structure of REITs and the re-deployable assets (real estate) they hold, (3) the slightly positive initial-day return is offset by the poor performance in the 190 days subsequent to the IPO, and (4) the change in U.S. REIT IPO performance before and after 1990 is likely due to a change in the REIT structure.     

The effects of venture capitalist affiliation to underwriters on short- and long-term performance in French IPOs

This paper explores the signalling and monitoring effects of venture capital (VC) backing and venture capitalist affiliation to lead underwriters on performance of IPOs in France. IPOs in which VCs are affiliated to lead underwriters (i.e., affiliated VCs) have lower underpricing than both non-affiliated VC-backed IPOs and non-VC-backed IPOs. Similarly, affiliated VC-backed IPOs exhibit greater earnings surprise and better market performance at the end of the one-year period following the IPO date. Controlling for Fama and French [Fama, E.F., & French, K. 1993. Common Risk Factors in the Returns on Stock and Bonds. Journal of Financial Economics 33, 3–56] risk factors, our results suggest that IPOs with affiliated VCs in general, and particularly those affiliated with more prestigious underwriters, have a higher long-term abnormal return than both non-affiliated and non-VC-backed IPOs. Our analysis of IPO performance indicates that more prestigious underwriters enhance effective screening, certification and monitoring roles of affiliated VCs.     

Performance of Malaysian IPOs: Underwriters reputation and management earnings forecasts

This paper examines the financial performance of Malaysian initial public offerings (IPOs) during the period 1980–1995. The major focus of the study is on the role of management earnings forecasts and underwriters in the valuation of IPOs. The results suggest extremely high and statistically significant initial premiums and positive and statistically significant long-term returns up to 3 years after listing. The findings for long-term returns contradict the consensus of the IPO literature that documents a significant negative long-term performance. Our results indicate a negative association of upward bias in management earnings forecasts with IPOs' performance during the first 12 months after the IPOs.